import java.util.Scanner;



public class MyDCTester {



    public static void main(String[] args) {

         String expression, again;

         int result;

         try
         {
             Scanner in = new Scanner(System.in);

             do
                 {
                 MyDC evaluator = new MyDC();
                 System.out.println("Enter a valid postfix expression: ");
                 expression = in.nextLine();

                 result = evaluator.evaluate(expression);
                 System.out.println();
                 System.out.println("That expression equals " + result);

                 System.out.print("Evaluate another expression [Y/N]? ");
                 again = in.nextLine();
                 System.out.println();

            }
             while (again.equalsIgnoreCase("y")) ;

        }
             catch(Exception IOException)
         {
             System.out.println("Input exception reported");

        }

    }

}


